I hope someone can help me out. My trucks is shaking every time I take off from a dead stop. It's even worse under a load I have a ten thousand pound camper I pull and the truck shakes and vibrates like crazy until I get to about 25-30 miles an hour. It kind of feels like I'm running over a rumble strip on the side of the road. I have just over 80 thousand miles. Probably 60 thousand of these miles have been with a trailer. I started experiencing this when I hit 60 thousand miles and its slowly been getting worse and worse. The only thing I changed around that time was my tires I went to BFG all terrain and upped the size to 305. Any help is very much appreciated.

 

could be the flywheel coming apart the dual mass has been known to if you have the 6 speed also check your u joints and carrierbearing also

 

Check your U-joints.

 

I had this problem with the lift and it was the spacing under the carrier bearing. But seeing as you dont have a lift on your sig i would also say the u-joints.

 

Same thing happened to me about 3 weeks ago. Started off like if I were going over some small bumps and then slowly started getting worse. Get under your truck and check your u-joints. Move the driveshaft for any play. It turned out to be a u-joint so I replaced it. Cost me 40 dollars for the u-joint and a headache to remove the old one. Once I got on the internet and did some research on how to remove the old one, it was a walk in the park. I am willing to bet its the u-joint.

 

U-joint, carrier berarings would be the first place I'd look

 

Just did this on my 07...all three u-joints and the carrier where in bad shape.
Next up is the front u-joints and maybe the bearings.